Sofa



FIG. 1 is a front elevation view of a sofa, showing a back of the sofa in a reclined position, in accordance with the new design;

FIG. 2 is a top elevation view thereof;

FIG. 3 is a front elevation view thereof, showing the back of the sofa in an upright position;

FIG. 4 is a back elevation view thereof, showing the back of the sofa in the upright position;

FIG. 5 is a side perspective view thereof, showing the back of the sofa in the reclined position, an opposite side perspective view being a mirror image thereof; and,

FIG. 6 is a side perspective view thereof, showing the back of the sofa in the upright position, an opposite side perspective view being a mirror image thereof.

The broken lines shown on the sofa are understood to represent stitching. 

The ornamental design for a sofa, as shown and described. 